how just about every rock singer who came along after Bob Dylan, copied his style? Just to point out one notable example, listen to Keith Richards' vocal on "You Got the Silver" (from Let it Bleed, the first Rolling Stones album I remember hearing). It is reputedly his first solo vocal. Why would he borrow from Dylan? Well, everyone did.
One other thing about Let it Bleed: did you know that "Love In Vain" was written by the legendary Robert Johnson, but wasn't credited to him on the cover?
A lawyer who likes to write music commentary.